Loewen window specs look good but I would see about replacing the argon gas with krypton gas. Argon gas is 20% denser than air and krypton is 90% denser than air. I replaced my windows 3 years ago with Great Lakes Uniframe Maxuus 10. They are triple pane krypton gas filled. Really helped a lot for noise and fantastic efficiency. They have an U factor of 0.20 for double hung an U factor of 0.18 for casement and picture windows. Average list price was for me just over 1200 each. Price depends on size.
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I would guess that overall it is a great idea. Our double-pane glass makes a significant difference when you close the windows. BUT, the low notes of performance car exhaust that you are complaining about will probably be the less effected end of the audio range that they are able to block out. At least that's been my experience with our windows. I have no idea what gas they use inside (per the above suggestion). You may also want to consider sound barrier curtains, which unfortunately seem to usually be quilted. There was also a company in VT that made quilted shades that ran on tracks on either side of the window and effectively sealed the windows shut - those were primarily for insulation but I noticed they also have a huge impact on sound (my parents had them at their house and you could never tell when a car had arrived when those shades were down, which was not the case when they were up).
Argon or Krypton gas is really mainly beneficial for solar heat gain and loss. For sound control, air (or even better a vacuum) is preferred, so stick with the Loewen argon gas.....they've done their tests.
The 40 STC rating they achieve is pretty good and the keys to this result are the reasonably large air space (21mm compared to industry standard 12mm), and the use of laminated glass for the internal glass skin.
To REALLY control sound through glass, you would need an air/vacuum gap of 1" minimum and 2 sheets of 1/2" to 3/4" laminated glass so this is mostly impractical in residential dwellings.
The Loewen system as I mentioned, allows both sound AND solar benefits. If you wanted only the acoustic reduction, you could achieve the same results with a single skin of 3/4" LAMINATED glass (1/2"+1/4").
Double paned windows help a great deal, no doubt about it. But you may get even more benefit from siding with a cement board product such as Hardi-plank and insulating your walls. I recently built an addition with basic Andersen two paned windows, R-13 fiberglass in the walls, and Hardi-plank on the exterior. It won't drown out the mufflers entirely, but it is amazingly quiet in there. Addressing just the windows focuses on too small a square footage. Your walls are most likely transmitting most of the noise; they comprise a much larger area.
Smata67, thanks for that idea ... however, I live in one of those traditional, old Chicago buildings that has a "thrust" sunroom at the front of the living space (an example; not my place but similar, just remove that arch). The exterior walls of my living room (which is my stereo room) have seven windows over three short spans; roughly 40% to 50% or more of that area is glazed. The side wall extending back is made of 85-year old Chicago brick and I doubt you could hear a boiler explosion through it.
Some kind of interior treatment for the windows would give the best bang for the buck, I think. Here's another idea. My mother lives on the six floor of a condo building with a busy street down below in Miami and one thing I have noticed is how much more quiet the room with the balcony is. The structure tends to block noise from hitting the sliding glass door, since it is between the source and the window. If you could simulate something like that, perhaps with some flower boxes extending out a couple of feet, it might help some.
As a studio owner, I have been through this. We spent lots of $$ on sound reduction. The laminated glass between the 2 rooms cost around $4k. This was 1" laminated and 3/4" laminated.
I was going to have outside windows but decided not to since there would be no way of getting STC ratings above 35 or so. The best ones that I saw were Milgard Quiet Line.
I would suggest either 2 things... Use double set of windows with about 6" air space or use a rigid fiberglass insert that will fit into the window frame. The only thing that will stop sound is air space and mass.
You can look on my website for pictures of the fiberglass insert. It's removable and we placed them behind plantation shutters.